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You (the analyst) are asked to determine the concentration of a solution of diclofenac-Cu complex. You are

provided with a 100 ppm diclofenac-Cu standard and an unknown. Both solutions are aqueous solutions (DI water), adjusted to ~pH 5. What is the calibration blank? What is the sample blank? What is the sample blank if the sample prep procedure requires you to add powdered diclofenac to DI water, pH adjust to 5, add CuCl2 , boil the solution for 1 h, and filter through a 0.45 micron PTFE filter. What is the calibration blank now?